In human females,Barr bodies are formed by:

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(D) According to the Lyon hypothesis,in human females,one of the two $X$ chromosomes in each somatic cell is randomly inactivated during early embryon

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Inactivation of either mother's or father's $X$ chromosome

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(D) According to the Lyon hypothesis,in human females,one of the two $X$ chromosomes in each somatic cell is randomly inactivated during early embryonic development to ensure dosage compensation.This inactivated $X$ chromosome becomes highly condensed and is visible as a dark-staining structure known as a Barr body.Since the inactivation is random,it can involve either the $X$ chromosome inherited from the mother or the $X$ chromosome inherited from the father in different cells.

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